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United States Patent |
5,791,097
|
Winston
,   et al.
|
August 11, 1998
|
Earth tremor suppressing cable suspension system for buildings bridges
and homes
Abstract
A method of supporting structures, embodied as a multiple telescoping pier,
multi-point, interconnected cable and pulley supple support mechanism
especially for use on prefabricated buildings, platforms and bridges which
are built on land areas which have a known history of experiencing earth
tremors, earthquakes, or ground swelling.
Inventors:
|
Winston; Paul K. (9401 E. Chenango, Englewood, CO 80111);
Sommers; Dale C. (P.O. Box 867, Conifer, CO 80433)
|
Appl. No.:
|
451208 |
Filed:
|
May 26, 1995 |
Current U.S. Class: |
52/167.1; 52/167.3 |
Intern'l Class: |
E02D 027/34 |
Field of Search: |
52/167.1,167.4,167.6,167.7,167.8,1,167.3
|
References Cited
U.S. Patent Documents
5259159 | Nov., 1993 | Kawase et al. | 52/167.
|
Primary Examiner: Friedman; Carl D.
Assistant Examiner: Smith; Creighton
Claims
We claim:
1. A gravity actuated system of resiliently supporting a structure upon an
earthen building site, for the purpose of absorbing and mitigating earth
tremors and earth movements, utilizing a building platform, multiple
telescoping piers, multiple cables, multiple pulleys, and pivotable,
slidable, and rotatable load bearing elements, said method comprising:
a factory fabricated building platform assembly for use as a base platform
in the construction of homes, buildings and bridges which building
platform is built in two or more separate linear portions intended for
later joining, each containing a multiple, laminated lower framework with
flooring joists interspersed and connected therewith, and said lower
framework has a flat decking attached, suitable for building upon;
a plurality of steel threaded clamping rods having a structural integrity
which secure and strengthen the structural integrity of the separate
linear portions, and hold said separate linear portions rigidly together
to form a complete building platform assembly; and
a multiplicity of corrosion resistant large diameter cable portions, that
have both free ends anchored to an anchor means underneath said building
platform, said cable portions together forming a cable network grid
underneath said building platform, and said cable network communicates
with and operates in conjunction with;
a multiplicity of parallel, tubular, segmented, telescoping piers which
lower segment resides in the earthen building site, and project upwardly
from the earthen building site, and which telescoping upper segment is
rigidly attached to the building platform assembly lower framework, and
said upper segment is supported solely by said cable portions, and said
telescoping piers cooperate in conjunction with seismic disturbances and
said cable network to provide a vertically moveable and height adjustable
supple support means for the said building platform;
a multiplicity of deep groove pulleys mounted internally and externally
upon both said telescoping pier segments, providing a rotatable bearing
means for said cable portions, and said cable portions cooperate and
communicate with said pulleys to lift or lower said telescoping pier
segments;
a captive, rotatable and slidable lower mounting platform, mounted inline
with each individual telescoping pier lower segment, and the said
rotatable slidable platform is placed to centrally bear upon a thick neck
ball joint coupler, said ball joint coupler resides vertically inline with
said telescoping pier lower segment, and the ball joint coupler is
vertically mounted to the earthen building site by means of a reinforced
concrete footing;
a thickened, rot proofed, resilient shock absorbing lower facing placed
underneath said concrete footing for absorbing initial seismic shock
pounding.
2. The resilient support system method of claim 1 wherein an excavation is
made under the building platform and a multiplicity of steel channel I
beams are driven vertically into the earthen building site, nearby the
outer perimeter of said excavation, and under the building platform, and
said I beams slidably contain a series of laminated rot proofed wall
panels, said I beams and said wall panels together comprise a moveable
wall system not permanently connected to said building platform, and a
flexible insulative membrane resiliently connects the building platform
with said wall panels as a weather proof seal.
Description
FIELD OF THE INVENTION
The field of the present invention relates to the art of cable suspension
and oscillation motion damping means, as applied to buildings and bridges
desired to be built and placed within a known earth tremor prone area. The
present invention specifically relates to a cable type gravity operated,
multi-point earth oscillation compensating, building platform suspension
unit, provided with multiple earth embedded "sensors" connected to
parallel telescoping piers that instantly telegraph motion, and the
interconnected cables transfer compensatory motion to adjacent companion
suspension components, and the present invention cable suspension system
thusly serves to autolevel the supported structure during seismic motion.
BACKGROUND OF THE INVENTION
As the surface of our earth grows and shifts with movement of the
underlying geologic continental plates, land regions often experience
earth tremors or earthquakes. Some land regions experience these tremors
on a regular basis, but it has been found desireable to place buildings,
dwellings and bridges in those regions. Oftentimes, structures such as
these are damaged or completely destroyed during seismic activity, and
subsequently need to be replaced.
When replacing such structures, conventional construction techniques employ
heavy reinforcing of the replacement structure, adding reinforcing beam
structures, re-pouring concrete footings with additional embedded
reinforcing, including strapping down and securing appliances and heavy
furnishings, et cetera. Ground swelling such as found in land areas with
expansive soil like bentonite, clay, or regions with permafrost requires
buildings to have extremely rigid foundations, structures which can
withstand the earth swelling pressures present, soil amendments to the
building site, or lengthy cassions which connect to the underlying
bedrock. During moderate or light seismic activity, these construction
methods protect a building from damage to a degree, but presently the
search continues for an acceptable and reliable quake zone construction
technique for new structures and remodels.
Other previous techniques of providing for earthquake proofing of a
building structure are illustrated by the prior art references following.
Included among these techniques are those which utilize a suspended
counterweight assembly disclosed in U.S. Pat. No. 3,940,895 by Yamamoto et
al; the base weighted obround spherical structure as is found in the U.S.
Pat. No. 3,916,578 of Forootan et al; the spring supported resilient floor
structure described in the U.S. Pat. No. 3,606,704 issued to Clyde T.
Denton; the slidable and rotatable bearing support footing of U.S. Pat.
No. 3,105,252 by Robert L. Milk; and the flexible saddle mount to be used
on a spherical tank illustrated in U.S. Pat. No. 3,606,715 by Walter Wyss
and Peter Feverlein.
Elegant cable suspended bridges have been in use in earthquake prone areas
without experiencing significant damage from tremors, including the famous
Golden Gate Bridge in San Francisco Calif. Inventors have successfully
improved upon this basic cable suspension method, designing for cable
suspension bridges and also marine ship to dock load handling cable
suspensions, both of which compensate for movement relative to the cable
anchor point.
Illustrative of such cable suspension techniques are; the cable-stayed
bridge of John Muller, described in U.S. Pat. No. 5,121,518, and also the
John Muller U.S. Pat. No. #5,241,721; the counterweighted offshore crane
wave motion compensating apparatus disclosed in U.S. Pat. No. 4,544,137;
the hydraulic ram assisted sea swell compensating apparatus found in U.S.
Pat. No. 4,236,695 by Archibald J. S. Morrison; a multiple pulley
hydraulically actuated portable balanced motion compensated lift apparatus
found in U.S. Pat. No. 4,593,885 of Donald J. Hackman, Don W. Caudy, and
Leslie F. Nikodem; and the hydraulically tensioned lifting apparatus
outlined in the U.S. Pat. No. 4,025,055 of William Josef Strolemburg.
Additionally, the cable type road vehicle suspension systems have proven to
be of good utility and design, such as the hydraulic assisted lever and
cable suspension system for road vehicles found in U.S. Pat. No. 2,823,926
of A. C Stover; and the adjustable compensating tandem wheel cable and
lever suspension for vehicles and trailers disclosed in the U.S. Pat. No.
3,304,097 of O. M. Lewis.
These references of the art are brought into view as embodiments of the art
of earthquake resistant structures and as illustrative of the art of cable
suspension assemblies in general.
Disclosed by the applicant to the PTO on Mar. 20 1995 in a package
submitted under the Disclosure Document Program, Ser. No. 372,752, it is a
primary object of the present invention to overcome deficiencies in
present construction techniques and the prior art methods of earthquake
proofing of buildings and structures by now providing for a multi-point,
multiple pier, moveable cable supple suspension system to be used on
prefabricated buildings, building platforms, bridges and the like, which
suspension system is capable of absorbing earth movement, and the
suspension system is permanently anchored to the building site, and
resiliently supports the structure above it.
It is a further object of the present invention to provide an adjustable
and equalizing cable suspension system for supporting a structure above,
which will be of very simple and practical construction, moderate in cost,
transparent in operation, easy to install, and having no special
maintenance requirements.
SUMMARY OF THE INVENTION
The present invention in the preferred embodiment comprises a resilient,
earth tremor/earth movement suppressing suspension mounting for use in
supporting prefabricated buildings, building platforms, bridges, and the
like. The suspension is securely bracketed and affixed to laminated
perimiter foundation beams comprising the preferred base of the supported
structure. Through the use of a series of anchored heavy duty telescoping,
compressible-expandible hollow piers operating in conjunction with a
multiplicity of heavy duty pulleys mounted within and thereupon, and a
multistrand metallic cable running between the individual piers as an
interconnected cable network, the present cable suspension system firmly
anchors and resiliently holds and supports the structure above.
The hollow piers lowermost earthen anchor point serves as a `ground sensor`
and any vertical motion at the `sensor` is immediately telegraphed through
the adjoining cable network to all adjacent piers in the present cable
suspension system. Through the telegraphing of vertical motion, the
supported structure remains leveled relative to any earth wave or earth
swell motion. The design of the preferred embodiment provides for an
overall vertical motion capacity of approximately 3 feet, allowing for
absorbtion of earth wave movements of record, although larger or smaller
vertical motion capacities could be designed for.
Earth shaking motions are compensated for by the present invention through
use of sliding/rotatible captive mounting platforms which allow for a side
to side motion capacity of 6 inches overall, 3 inches from centerpoint in
the present embodiment. Larger side to side motion could be designed for
however, by increasing the scale of size. The sliding/rotatible mounting
platforms are placed directly above the `ground sensor` and are connected
to and are present at each pier individually. The sliding/ rotatible
mounting platforms co-operate with the present cable suspension system to
provide for a stable platform capable of withstanding repetitive earth
movements, either earth waves or earth shaking, or both in combination. An
optional thick neck ball joint leveling coupler is mountable at the base
of each individual pier, positioned below the mounting platform, for
building use in vicinities experiencing repeated severe earth movement
activity. The leveling ball coupler provides for a 45 degree or greater
horizontal movement capacity of the individual concrete footings, relative
to the suspension pier, the perimiter beam, and the supported structure.
The present cable suspension system is protected and contained under the
supported structure through use of a series of laminated panelized
`basement wall panels` which reside within and between metallic I beam
containment channels. The I beam channels are vertically driven deep into
the earth outboard of the supported structure `drip line` and project
upwardly to a variable dimension dependent on building sites. The
panelized wall panels are preferably faced with a rot and moisture proof,
semi flexible facing such as compressed silica board or fiberglass
composites, and the panels are filled with an insulative bonding foam
between the facings. A flexible skirt membrane provides a weather and
rodent proof cap which is capable of movement with the supported
structure. The skirt membrane is mounted to the supported structure and
overlaps the panelized basement wall panels, and is bermed into the earth
beyond the drip line adjacent to the supported structure. In the case that
the supported structure is a residence or inhabitable structure of any
type, a series of flexible utility connectors is also employed in the
present suspension system to allow for a degree of supported structure
movement without interrupting utility service to the structure.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 Is an underside isometric view of the cable suspension system.
FIG. 2 Is a cutaway view of a suspension pier, shown under load; where
FIG. 2a is a frontal view of FIG. 2,
FIG. 2b is a side view of FIG. 2.
FIG. 3 is a cutaway exploded view of a suspension pier not under load;
FIG. 3a is a frontal view of FIG. 3,
FIG. 3b is a side view of FIG. 3.
FIG. 4 is a cutaway elevation view of a suspension pier, showing the
protective membrane and wall panels.
FIG. 5 is a side view of a suspension pier, cutaway at the
sliding/rotatible mounting foot, illustrating preferred vertical travel
capacity of the suspension pier.
FIG. 6 is an underside isometric view of an `X` cable crossing suspension
pier.
FIG. 7 is an underside isometric view of a `T` cable crossing suspension
pier.
FIG. 8 is an underside isometric view of a `L` cable crossing suspension
pier.
FIG. 9 is a top isometric view of an exploded `L` cable crossing suspension
pier, illustrating a sliding/rotatible platform and the ball joint coupler
mounted below it.
DETAILED DESCRIPTION OF THE DRAWINGS
Disclosed hereby is a freestanding cable suspension assembly which can be
packaged as a kit and assembled at an on-site building location and is
identified as a mulitpoint cable suspension system and method of
supporting structures, to serve as a pier type foundation to be used on
prefabricated homes, buildings, bridges- and the like- which are built on
land or in geographic zones which have a known history of experiencing
earth tremors, earthquakes, ground swelling, or permafrost.
With reference to the attached drawings, FIGS. 1-9, the multipoint cable
suspension system is comprised of several distinct parts, and is
supportive to a structure mounted above it, the structure represented
herein generally as the decking 1, and the present system basically
requires the use of a multistrand corrosion resistant metallic cable 12,
forged steel pulleys 8, 10, 11, and several large, dimensional, heavy
duty, square steel tubing elements which form a telescoping suspension
pier. The telescoping tubing sections, when nested and assembled together
comprise a telescoping suspension pier 4. The tubing sections telescope
and nest parallel inside one another, (and are hereinafter called the
inner tubing section 4b and the outer tubing section 4a). Throughout the
present invention, a series of heavy duty deep groove steel pulleys 8, 10,
11 with oversized axles are employed, and two of these pulleys 10, 11
reside internally to the inner tubing section 4b, with an additional
series of two (or more) lower pulleys 8 residing externally upon the outer
tubing section 4a.
The outer tubing section 4a is provided with a beam mounting bracket 5
which also serves as the uppermost end cap. This bracket 5 is securely
bolted to a laminated wooden dimensional beam 2 which comprises the
supported structure's foundation perimiter and central support beams. The
laminated beam 2 is blocked and fastened to a conventional joist system in
a maimer as is known in the art. This technique is known as "Wooden Post
Tension Frame Construction". The laminated beam is separated by the
conventional joists from it's twins that are mounted parallel. A series of
three or more threaded steel clamping post tension rods 3 penetrates and
spans the distance between both of the opposing parallel laminated beams
2. The post tension rods are tightened using locknuts and securely serves
to hold the opposing laminated beams 2 in tension onto the conventional
joists. A decking 1 is attached to the uppermost face of the laminated
beam 2.
The outer tubing section 4a is fitted with a plurality of lower pulleys 8
(two, three, or four individual pulleys). These plurality of lower pulleys
8 are permanently mounted externally onto the outer tubing section 4a,
with strong steel brackets 9, and this bracket 9 and lower pulley 8
assembly is located near the lowermost end of the outer tubing section 4a.
These lower pulleys 8 and the brackets 9 extend vertically outward at 90
degrees from the flattened face of the outer tubing section 4a. Preferred
construction methods employed in the manufacture of the outer tubing
section 4a describes and identifies three distinct subsets:
Subset 1, which has four individual lower pulleys 8 externally mounted to
the lowermost base of the outer tubing section 4a;
Subset 2, which has three individual lower pulleys 8 externally mounted to
the lowermost base of the outer tubing section 4a;
Subset 3, which has two individual lower pulleys 8 externally mounted to
the lowermost base of the outer tubing section 4a.
Each of the above identified outer tubing 4a subsets is designated for
placement at specific locations within a cable grid defined by the present
cable suspension building support system:
Subset 1 is to be placed as an central cable suspension pier, and employs
the use of two individual cables 12. It is known as an "X" cable crossing
suspension pier 15.
Subset 2 is to be placed as an outboard or building perimeter cable
suspension pier, and employs the use of two individual cables 12. It is
known as a "T" cable crossing suspension pier 16.
Subset 3 is to be placed as a perimeter comer anchor cable suspension pier,
and employs the use of two individual cables 12. It is known as a "L"
cable crossing suspension pier 17.
The inner tubing section 4b has its lowermost 2/3 portion embedded into
concrete footings 6. This embedded portion of the inner tubing section 4b
is identified as the footing mount segment 7. This footing mount segment 7
of the inner tubing section 4b has several "deadman" type of extrusions
along its length to assist in securing and anchoring this segment 7 to the
concrete footing 6. In the preferred embodiment, a resilient mounting foot
23 is provided underneath the concrete footing 6, as a lowermost bearing
point for the concrete footing 6, and the concrete footing 6 rests upon
the resilient mounting foot 23. The resilient mounting foot 23 provides
for an initial shock impact absorbtion of sudden earth wave activity.
A further set of pulleys reside within and are contained upon the upper
portion of the inner tubing section 4b: They are hereinafter identified as
the upper pulley 10, and the intermediate pulley 11. The upper pulley 10
is located within a channel at the uppermost extremity of the inner tubing
section 4b. It is rotatable along a horizontal axis and is vertically
mounted. The intermediate pulley 11 sits in a recessed opening which
penetrates clearly through the mid-section of the inner tubing 4b height
and the intermediate pulley 11 is placed directly below the upper pulley
10. The intermediate pulley 11 is preferably placed at a an angle 90
degree opposed to the relative vertical position of the upper pulley 10.
The intermediate pulley 11 is also rotatable on a horizontal axis and is
vertically mounted.
The intermediate pulley 11 and the upper pulley 10 have a diameter equal to
or slightly less than that of the interior dimension of the outer tubing
section 4a which surrounds both these pulleys 10, 11 after assembly.
Thereby, the intermediate pulley 11 and the upper pulley 10 serve as
bearing blocks to prevent rocking or excessive side to side freeplay of
the outer tubing section 4a as the outer tubing section 4a moves
vertically during suspension travel. A set of pillow blocks serve to
provide this function at the base of the outer tubing section 4a and are
provided only where no cable 12 passes within this juncture, such as on a
`T` or `L` cable crossing suspension pier 4.
A heavy flathead cable stay bolt 13 is inserted at the base of the inner
tubing section 4b, and penetrates through the inner tubing section 4b,
near the concrete footing embedment 6. The flathead cable stay bolts 13
are placed so as to reside inline and underneath the inner tubing section
pulleys 10, 11, which they serve, either serving the upper pulley 10 or
serving the intermediate pulley 11, relative to a `T` or an `L` cable
crossing suspension pier 4 . The bolts 13 are held in place by hex nuts
and flat steel washers as is known in the art.
The present invention in its present form utilizes an interconnected
network of high strength non corrodible large diameter cables 12 spanning
the distance between pier sections 4 and the cable 12 loops through the
tubing sections 4 and rests upon the pulleys 8, 10, 11 within the cable
suspension system. A cable tensioning locking turnbuckle 14 is employed at
each individual strand of cable 12 in the present cable suspension system,
to facilitate cable 12 placement in relation to the assembled suspension
piers 4. The cable network interacts with all of the inner tubing section
4b and outer tubing section 4a pulleys 8, 10, 11. As viewed from above,
each individual cable 12 follows a straight line course, and when viewed
from the side, the cable 12 follows a serpentine course. Each individual
cable 12 serves only ONE line of a variable size grid of the cable 12
network in the present invention.
The primary cable routing technique utilized in the present invention
describes the following cable course: At its free ends, each individual
cable 12 is securely anchored to the cable anchor bolts 13. Originating at
this anchor point 13, and viewed from the side, the cable 12 proceeds
vertically upwardly, (being contained within the outer tubing section 4a)
and then passes over the upper pulley 10, then proceeds vertically
downwardly and passes under a lower pulley 8, then proceeds horizontally
in free space to the next inline suspension pier 4, then passing under a
lower pulley 8 there, and then proceeds vertically upwardly (within the
outer tubing section 4a) to pass over an upper pulley 10, etc, . . .
finally being anchored at the opposite free end of the straight line in
the cable grid by a cable stay bolt 13.
The secondary cable routing technique in the present invention utilizes the
intermediate pulley 11 which is contained captive within the inner tubing
section 4b, and this cable routing technique depicts routing the cable 12
in a similar manner: The cable 12 originates at the anchor point 13, and
the cable 12 proceeds vertically upwardly,(contained within the outer
tubing section 4a) to pass over the intermediate pulley 11, then passes
vertically downwardly, to pass under an lower pulley 8, then proceeds
horizontally in free space to the next inline suspension pier 4, passing
under a lower pulley 8, there, then the cable 12 proceeds vertically
upwardly, (contained within the outer tubing section 4a) to pass over an
intermediate pulley 11, etc . . . finally being anchored at the opposite
free end by a cable stay bolt 13. This technique is used within the
present cable suspension whenever it is desired to have individual cables
12 cross over other separate individual cables 12.
A captive slidable and rotatable steel plate coupler platform 18 is
provided at the inner tubing section 4b and visually appears as two
concentric circles when viewed from above. The coupler platform 18 is
preferably constructed of interlocking heavy flat steel plate, and it is
coated on all of it's load bearing faces with a friction reducing coating
like teflon or a similar material. The coupler platform 18 is identified
as having two separate parts; the captive rotatible element 18a, and the
captivating enclosure 18b. Additionally, the inner tubing section 4b is
divided into two separate segments to accommodate this coupler platform
18;
The footing mount segment 7; and
The uppermost segment 7a.
This coupler platform 18 provides cushioning for a degree of lateral or
shaking movement of the laminated beam 2 and supported structure (relative
to any movement of the outer tubing section 4a and the concrete footing 6)
The coupler platform 18 captivating enclosure 18b is mounted to the
uppermost segment 7a and it's captive rotatable element 18a is permanently
mounted to the footing mount segment 7. The coupler platform 18 rotatably
joins the inner tubing section 4b footing mount segment 7 to the uppermost
segment 7a. The coupler platform 18 provides a stable and flattened foot
for the uppermost segment 7a. The coupler platform 18 is mounted to the
footing mount segment 7 at a point approximately 4 inches above the top
face of the concrete footing 6. The footing mount segment 7 of the inner
tubing section 4b is permanently embedded into the concrete footing 6. The
present design of the coupler platform 18 allows for an overall side to
side movement of 6 inches, and a 3 inch side to side movement from
centerpoint, but larger movement amounts could be designed for. The
coupler platform 18 also provides for a rotation ability of the concrete
footing 6, relative to the uppermost segment 7a, and isolates the
uppermost segment 7a from the concrete footing 6. This arrangement of the
cables 12, operating in conjunction with the telescoping suspension piers
4, and the rotatible coupler platform 18 compensates for ground wave
induced motion.
Additionally, an optional ball joint leveling coupler 22 is provided below
the coupler platform 18. The ball coupler 22 allows the concrete footing 6
to angularly shift from it's original vertical position during seismic
activity without transferring the displacement angle to the footing mount
segment 7a and the rest of the present cable suspension system. The ball
coupler 22 is utilized in land areas which have particularly loose soil or
as deemed necessary by site inspection.
The present cable suspension system performs a useful function in
supporting a structure during seismic activity. Any vertical movement of
any of the individual inner tubing sections 4b causes a tightening or
loosening of the cable 12 network throughout the entire array. The
response time is immediate, and the suspension system thus autolevels the
entire array, absorbing ground wave motion before it reaches the supported
load or building. Vertical movement experienced on any footing 6 sensor
position within the array will result in system movement and full
compensation for all components in the cable network.
When the present invention is utilized to support an inhabitable structure,
and to enhance building safety for occupants, a series of flexible utility
and sewage couplings are employed. The flexible couplers provide for a
moderate amount of seismic disturbances movement without disconnecting the
building from it's utilities, and are known in the art.
In certain geographical areas,when used to support an inhabitable
structure, the present cable suspension system is protected and contained
under the supported structure through use of a series of laminated
panelized `basement wall panels` 20 which reside within and between
metallic I beam containment channels 21. The I beam channels 21 are
vertically driven deep into the earth outboard of the supported structure
`drip line` and project upwardly to a variable dimension dependent on
building sites. The panelized wall sections 20 are preferably faced with a
rot and moisture proof, semi flexible facing such as compressed silica
board or fiberglass composites, and the panels 20 are filled with an
insulative bonding foam between the facings.
A flexible double wall insulative skirt membrane 19 provides a weather and
rodent proof cap which is capable of movement with the supported
structure. The skirt membrane 19 is mounted to the supported structure and
overlaps the panelized basement wall panels 20, and is bermed into the
earth beyond the drip line adjacent to the supported structure. The
flexible membrane 19 moveably connects the laminated beams 2 of the
supported building with the optional wall panels 20 as is necessary to
compensate for movement of the wall panels 20 relative to the laminated
foundation beam 2 during seismic activity.
Although the present invention has been described herein with
particularity, relative to the foregoing detailed description of the
preferred embodiment, i wish it to be understood that this description of
the disclosed invention is done to fully comply with the requirements of
35 USC Sect. 112, and is not intended to limit the invention in any way.
Various modifications, additions, and applications other than those
specifically outlined herein will be readily apparent, without departing
from the spirit and scope of my present invention, to those having
ordinary skill in the art. In example, although the present invention is
described herein as utilizing single individual pulleys 8, 10, 11, it is
anticipated that a multi-pulley or gang-pulley system and multiple
parallel cables 12 could be employed as is known in the art, to allow for
heavier loads, stresses, or larger building support. Accordingly, it is
desired that the scope of my present invention be determined not entirely
by the foregoing specification, and the embodiments illustrated, but that
it be defined by the appended claims and their legal equivalents.
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